Drill Rod Tool Steels 81175721 Flat Stock 4142 Alloy

Product Description

The DRILL ROD TOOL STEELS 81175721 is a pre-hardened alloy steel flat stock bar measuring 36 inches long, 5/16 inch wide, and 1/4 inch thick. Manufactured to AISI/SAE Type 4142 specification, this chromium-molybdenum alloy steel delivers high strength and wear resistance in its pre-hardened state, eliminating the need for additional heat treatment before use. At 0.79 pounds, it is easy to handle for precision cutting and machining operations. Machinists, tool and die makers, and fabricators rely on this material for tooling, fixtures, guides, and wear components where consistent hardness and dimensional accuracy are required.

This flat stock is suited for industrial and commercial fabrication environments where close-tolerance stock is needed off the shelf. The AISI/SAE 4142 pre-hardened alloy is commonly used in machine shops, maintenance facilities, and fabrication shops for creating punches, dies, shafts, brackets, and custom tooling components. Its pre-hardened condition makes it ready for immediate machining to final dimensions without heat-treat cycles, reducing turnaround time on tooling and fixture work.

Key Features

• AISI/SAE Type 4142 chromium-molybdenum alloy steel for high strength and toughness
• Pre-hardened condition - no additional heat treatment required before machining
• Length tolerance of plus 0.250 inch ensures full usable length on every bar
• Width tolerance of plus 0.005 inch and thickness tolerance of plus 0.001 inch support close-fit applications
• Square tolerance of 0.003 inch ensures consistent cross-section geometry
• Weighs 0.79 pounds - manageable for bench and manual machining setups

Compatibility

Designed as a general-purpose pre-hardened flat stock for machining, fabrication, and tooling applications requiring AISI/SAE Type 4142 alloy steel in a 36 x 5/16 x 1/4 inch bar form.

Installation Notes

Cutting and machining of pre-hardened 4142 alloy steel should be performed by qualified machinists using appropriate tooling rated for hardened stock. Carbide or coated cutting tools are typically required when working with pre-hardened material. Secure the stock firmly in a vise or fixture before cutting to prevent movement and maintain dimensional accuracy. Always wear appropriate PPE including eye protection and gloves when cutting or grinding steel bar stock.